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Send KeyPreviously else If KeyCount = 128 Send KeyPreviously else if KeyCount = 192 Send KeyPreviously KeyCount = 128 else KeyPreviously = 0 goto Loop ; ;
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This algorithm handles the key bouncing by requiring that ve consecutive polls 4 ms apart sense the key being pressed. When the bit goes high, the key read is reset until the next key press pulls down the row and the counting resumes. Multiple key presses (which obviously can happen when more than two keys in the same column are pressed at the same time) are resolved within the ScanColumn routine, and it is resolved by taking the lowest active bit in the column. The Send routine looks up the ASCII code to send by reading the value in a row/column table. It should be noted that the key modi ers (Ctrl, Func, etc.) are always masked off in Key1. I didn t bother to put in the modi ers because I didn t have an application that required the keyboard (and being lazy . . . ). They can be implemented easily by adding new tables for each modi er and then, before calling the table to look up the value, adding an offset to the correct table values. Note that I wouldn t bother debouncing the key modi ers because they are not the action that initiates the action of sending the keys. They are just used to make sure that the proper keys are sent. The code presented here (Key1.asm) could be ported very easily to a mid-range PIC microcontroller with the advantage that the TMR0 interrupt could be used to initiate the scan, allowing the keyboard read code to be run totally in the background. Another advantage of using a mid-range device is the ease in which the TRIS bits could be rotated directly within software rather than keeping track of the current TRIS value, as I have to do in this application. Along with porting the application to another PIC microcontroller, you also can change the tables I created for interpreting the different scan codes to another switch matrix keyboard easily. This application is a bit high end; if you were to use a 4 4 switch pad, this code could be used quite easily within one port rather than the two presented here. One last enhancement that could be made to this application is to use the built-in pull-ups on PORTB of most PIC microcontroller devices. This would avoid the need for the 9-pin common tap single in-line package (SIP) resistor that I used in this application.
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By far the most popular PIC microcontroller family is the mid-range family. This family is very well designed for sophisticated single-chip applications using the interruptenabled processor. Advanced I/O features can simplify applications and avoid the need for bit banging applications. The mid-range devices, with these features, often allow simpler applications than what might be possible ordinarily. In the following example projects, you will see that the feature of the mid-range family that I take the most advantage of is the interrupt capability. As I ve said elsewhere, this allows more sophisticated applications for the PIC microcontroller and, in many cases, simpli es the nal applications. When I use interrupts in an application, note that I rarely use more than one interrupt source at a time, and when I do, the second one is almost always the TMR0 interrupt to provide timing functions in the projects. The projects presented in the following sections are used not only to demonstrate different I/O and code methods but to also give you some concrete examples of how the different peripheral I/O functions work in an application. Clock: ANALOG CLOCK This was one of my rst PIC microcontroller applications and one that turned out to be very successful in fact, it has spent about 5 years on my desk at work keeping just about perfect time (Fig. 21.14). This unique timepiece can be wire-wrapped together in about an afternoon. Seventy-two LEDs (or 84 if you build it the same way I did and use 2 LEDs for the hours) provide a digital replica of an analog clock. For the application, I used a 32.768-kHz quartz watch crystal and a 2.8-V lithium PC backup battery to make sure that I didn t have to reset the clock if power was lost. The circuit uses ve 74LS154 four to sixteen demultiplexors, as I ve shown in Fig. 21.15, to drive the LEDs. One minute LED and one hour LED are displayed at any time from
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